Lansoprazolo Sun (Lansoprazole)

Lansoprazole is a proton pump inhibitor used to manage acid‑related gastrointestinal disorders.

• Gastro‑oesophageal reflux disease (GERD): reduces reflux symptoms and promotes healing of esophageal irritation.
• Peptic ulcer disease: promotes ulcer healing by suppressing gastric acid secretion.
• Helicobacter pylori eradication (in combination therapy): enhances the effectiveness of antibiotic regimens by creating a less acidic gastric environment.
• Zollinger‑Ellison syndrome: controls excessive gastric acid production associated with gastrin‑secreting tumors.

• Lansoprazole irreversibly binds to the H+/K+ ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells in the stomach. By inhibiting this final step of acid secretion, it markedly reduces both basal and stimulated gastric acid output, leading to increased gastric pH and allowing mucosal healing. The inhibition is dose‑dependent and persists until new enzyme molecules are synthesized, typically requiring 24‑48 hours for full recovery of acid secretion.

Lansoprazole may be associated with a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Headache: mild to moderate headache.
• Diarrhea: loose stools or increased frequency.
• Nausea: feeling of sickness or urge to vomit.
• Abdominal pain: discomfort or cramps in the stomach area.
• Flatulence: excess gas and bloating.

Serious or Rare Side Effects

• Clostridioides difficile infection: severe colitis presenting with watery diarrhea.
• Acute interstitial nephritis: kidney inflammation causing reduced urine output and swelling.
• Hypomagnesemia: low serum magnesium leading to muscle cramps or cardiac arrhythmia.
• Stevens‑Johnson syndrome: severe skin reaction with blistering and mucosal involvement.
• Fractures (hip, wrist, spine): increased risk with long‑term use.

Before prescribing lansoprazole, clinicians should consider several precautionary measures to ensure safe use.

• Assess renal function: dose adjustment may be needed in patients with severe kidney impairment.
• Review concomitant medications: avoid use with drugs that require an acidic environment for absorption.
• Monitor long‑term therapy: prolonged use may increase risk of bone fractures and vitamin B12 deficiency.
• Evaluate for infection risk: patients with a history of C. difficile infection should be monitored closely.
• Pregnancy and lactation: use only if the potential benefit justifies the potential risk to the fetus or infant.
• Store at ambient temperature: keep below 25 °C in the original packaging, protected from moisture and direct sunlight.

Lansoprazole can alter the pharmacokinetics of several medicines; awareness of these interactions helps prevent therapeutic failure or toxicity.

Major Interactions (Avoid)

• Antifungal agents (ketoconazole, itraconazole): reduced absorption and efficacy.
• HIV protease inhibitors (atazanavir, nelfinavir): markedly decreased plasma concentrations.
• Clopidogrel: diminished antiplatelet effect leading to reduced cardiovascular protection.

Moderate Interactions (Monitor Closely)

• Warfarin: possible increase in INR, requiring closer coagulation monitoring.
• Digoxin: may increase serum levels, necessitating dose adjustment.
• Methotrexate (high dose): potential for increased toxicity, monitor renal function.